Centrifugal ore separator



(No Model.) 3 sheets-Sheet 1.. 0. B.l PEGK. .GENTRI-PUGAL ORE SEPARATOR.I

No. 499,34?E Patented June 13, 18093.`

(No Model.)l

' 3 Sheets-Sheet 2.- 013.12EUR. GENTRIFUGAL ORB SEPARATOR.

' Patented June 13, 1893.

44%. @www l 3 Sheets-Sheet' 3.

(No Moden.)A

l0. B. PBGK. GBNTRIFUGAL om: SEPARATOR.

PatentedJune y13, 1893.

vllnlllrlllllllllrl/ UNITED 1 STATES oRRIN/nrncit, or CHICAGO,ILLINoIsAssIGNoR To MELINDA PEcK, or

PATENT OFFICE. `1

SAME PLACE.

CENT-RIFUGAL ORE-s EPARAToR.

SPECIFICATION forming part of Letters Patent No. 499,347, dated .T uneApplication tiled February 9, 1893. Serial No. 461.594. (No niodel.)

ToaZZ whom it may concern,.-

Beit known that I, ORRIN B. PECK, acitize'n of the United States,residing at Chicago, Illi nois, have invented certain new and usefulImprovements in Centrifugal Ore-separators, of which the following isa'specication.

In the drawings, Figure 1 is a central, longitudinal, broken, sectionalelevation of my improved machine.

Fig. 2 is a cross-section of Fig. l 0n line 2, 2, looking in thedirection of the arrows. that side of the defeotor or inner vessel,containing the holes or perforations, and partitions hereinafterdescribed with the part Il, omitted. y Fig. 4 is an end elevation ofFig. 1 on line 4 looking in the direction of lthe arrow. Fig. 5'isan'end view of a portion of the apparatus partly in section, taken onthe line 5 ofFig. l; and Fig. 6 is a side elevation of the wheel G,detached and provided with'a r greater number of `arms than in Fig. 5.

In making my improved centrifugal ore separator,l make a bed or frame,A, provided with brackets or standards A', on which the operative partsare intended to be mounted. I. make a treatment cylinder, B,'althoughnot necessarily a vessel or cylinder in a technical sense, as it may b eany kind of a vessel that' will serve the purpose, and' by the use ofthe word cylinder I mean to include any kind f of a vessel in which thetreatment may be carried out and with which the other parts may operateand preferably partlyclose it at Vits vends, so as to be adapted tocontain a body of water, or a suflicient quantity of water to submergethe separating surface and the material under treatmentand provide itwith a separating surface A2, on its inside, orforming its interiorwall. This vessel is preferably arranged i-n a horizontal position, andis mounted on the brackets A', supported by suitable journals ortrunnions in bearings a. It is preferably provided with a belt surface,

.13', so that it may be rotated by means of a belt, B2 operated' by anyconvenient motive power, although if preferred, other means may be usedfor rotating it. v

The vessel or cylinder, B, is preferably bell, or cone shaped, andprovided with trunnions, b, which rest in the bearings,- a..These'shafts or trnnnions are hollow, as shown in the draw- Fig. 3'is aside elevation of.

ings, for the purposes hereinafter described.

The vessel may be also provided with hand holes, b to permit access intoits interior, if

v desired, for cleansing and other purposes. If

desired, however, the vessel or be'straight, or in other form, and itmay be arranged in a vertical,iustead of a orizontal position.

Arranged within the vessel, B, is a dellector,

cylinder 'may 0the outside of which, or the larger portion thereof,preferably corresponds in form to that of the inside of the treatmentvessel, B, leaving an annular space or channelA5, between them, with thepartitions, orparts located therein, as hereinafter described, and

described. I Wish to say here, however, that y Ywhile I have shown' thedellector as a vessel,

yet, as its `main object is to form the inside Wall of .the passage orchannel in which the separation of the lighter material, or the lighterfrom the heavier is "eifected, and to afford means throughvwhichJ theheavier material is collected, it is not essential that it be in theform shown, and any other arrangelong as it serves to form the innerwalls of the Ways or channels in which the material is treated, andwhere the vessel form of deliector is not used other means are employedto rcmove or assist in the removal of the heaviermaterial. Nor need thechannel in which the material is treated be annu-laror extend entirelyaround the interior of the treatment vessel, as separate channels may beused instead of one continuous annular channel if preferred. I

i ment may be adopted that is preferred, so

shallfor convenience, however, describe the my improvements as they areexhibited in the drawings, and merely make the above explanationjtoshowjthat I do not intend to limit myself` strictly to details ofconstruir` l construction, arrangement and operations of tion, for asmuch latitude may be indulgedin the form, construction or detailsthereof `as desired, and the' circumstances or conditions will permit.

The defiector, C, is preferably provided at one end with a hollow shaftor trunnion, c, which extends out through one of the hollow trunnions ofthe vessel, and is supported in a bearing, c'. The other end of thedeiiector is preferably journaled at c2, on the shaft D. In order torotate the deflector I have mounted a pulley, C on the end of thetrunnion, c, so that it may be rotated by a belt, operated by anyconvenient motive power, although other 4 means ma'y be used, ifdesired, for rotating the deflector. Preferably inside of the dehector,I provide a compartment F2, of a form to permit the wheel G, to berotated therein; I also prefer to form alchannel or passage F' withinthe deflector along one wall or side thereof, and closed with respect toit, a1- though communicating with the compartment F2, I prefer that aportion of the side, or wall of the deiiector should form theouter -wallof the passage F and that such portion of the wall be supplied withholes or perforations, f to permit of the inflow of water and materialto the passage as hereinafter described.

I arrange a-shaft D, in suitable bearings, This shaft is extended out atone end through the hollow trunnion of the vessel, and

' at the other through the hollow trunnion, c,

of the defiector, s o that it may be rotated by4 a pulley, D', or otherconvenient means. The shaft D, is preferably made hollow at both ends asindicated by g and `g2 and provided with a Water supply pipe g3 at theend g by meansr of which preferably, comparatively clean,'^or cle'arwater is supplied through the passage g', in the shaft and theperforations d', and into the interior of the' defiector. Along eachside of the passage F', and through the walls' of thedeflector, I preferto, provide holes or perforations f, through which the wa ter introducedinto the deilector, or part thereof, may be'driven by the action ofcentrifugal force against the separating surface ora portion thereof tostir, detach, or disturb the particles of heavier materiali-lodged onthe separating surface, as it iscarried around close to the perforationsby reasonof the differential speed of rotationof;theseparts. On theout-'- side wall ofthe defiector, and aroundfthe holes or perforationstherein, I, prefer toffprovlde one 'or more 4projectingedgingsbr ribsd2,

Vwhich are intended tosextendouta sufficient.l

distance, so as to come closeio the separating surface, leaving,however, a suiiicient space between the surface .and rib to permit theheavierlnaterial'lodged on the separating surface to be carriedthroughsuch space, 11nder the rib or partition, as I mayvterm it this'partition serves as'means to prevent, orassist in preventing the4material being introduced t rial tothe treated orlseparatedls beingintrofor treatment and containing lighter particles, from beingdeposited, or flowing on that porparticles ar'e being removed. It alsoassists in preventing heavier material from escaping from the inflow tothe channel or passage F through the perforations f while it is beingdisturbed by the outflow of water through the perforationsf. Along nearthese perforations I prefer"'to provide smaller perfor-ations f2, which,or atleast the forward ones of which, are intended to be suiiicientlylarge to permit only a sufficient flow of Water through them to somewhatstir, or to assist in cleansing, or washing the heavier materialwith theclean water from the deflector, before it is removed from the separatingsurface, but not sufficiently large to permit aV strong enoughv flow ofwater, -to wash away the heavier material. Those of the perforations fthat follow behind the perforations f in their travel with respect tothe separating surface, have more particularly for their object theassisting of those traveling ahead, in supplying water to be taken upthrough the perforationsf and in preventing the re-lodgment or escape ofheavier particles. Such lassistance is rendered through the currentofwater supplied by them, which is mostly if not wholly deected toward andtaken up by the perforations f The perforationsf2, that follow those fhave more particularly for their object the assisting in preventing,the' 'lighter particlesof material from flowing or passing underthepartitions nearest to' them and commingling the heavier particles to beremoved. This object is -effected 'by the water supplied through suchperforations, `flowing under the `forming a current to wash orkeep thelighter ,particles back.

The rate of speed of rotation f the separating surface and the deilectoris intended to be somewhat different, and varied to such a degree as theconditions may require, so that a part of the separating surfacecarrying particles of heavier material that have lodged thereont, isconstantly passing under the partition, d2, and into proximity to theperforations where such heavier particles are removed or cleaned off,and the clean portion of the separating surface passes on out and aroundto againbe laden with heavier particles, and again cleaned offin thesame way. The speed of rotation of the deflector is preferably three orfour revolutions less per minute than that of the treatment vessel orseparating surface, although much latitude may be'induiged in thisparticular, and the differential speed of rotation of these parts may bevaried to such degree as will behest adapted to the material undertreatment. Of course, it will be understood that while the heaviermaterial is, in..`

this waybeingremovedor cleaned oiffrom "IOO one portion of theseparating surface', matep ducedon other-,portions of the separatingsur- :o5 partition, following nearest to them and thus face, where theseparation is being effected and the lighter material discharged. So it.will be seen that the operation may be carried on continuously anduninterrupted, although it may be intermittent, if desired.

On the endofthe deflector nearest where the material is introduced intothe vessel, I preferably provide a flange or ledge, Il, located withrespect to the perforations in the deflector, so as to deflect or guidethe material being introduced away from them, and away from that portionof the separating su rface that is in proximity to the perforations, and.from which the heavier-particles are being removed. Within thedefiector, on its side opposite to the passage F', I have arranged acounter-balance, h, to balance the excess weight, caused in forming thechannel F. On the shaft D, and adapted to be revolved with it, andWithin the compartment,'F2, I` mountthewheel G. This wheel is preferablyformed with a hollow central portion, or provided with channels orpassages, opening at, or near its periphery, and communicating throughthe holes or perforation's, g, with the hollow or passage g2, in theshaft. To enable the wheel to be rotated at the desired rate of speed, Imount on the' shaft, the pulley, D',

Y which may be operated by a'belt or in other convenient way. rlhe wheelis intended to be run at a slower rate of speed than the detieetor, and,of course, the water contained within the channel in the Wheel, will berotated, or carried around at the same rate of -speed as the wheel,which will be slower than the revolution of the Water contained inthecompartment F2, and lslower ,than most other portions of themachine,d since the centrifugal force and consequently the pressure ofthe water in the separator is occasioned by its rotation, andthe greaterthe speed of rotation, the greater the force and pressure developed, itfollows that the Water 4within the wheel G, will be subjected to a lessforce and pressure than the water within the compartment outside of thewheel. Hence the water outside of the wheel in the compartments F2, willrush or flow into the wheel, forcing the water alreadyin the wheeltoward the center, through the perforation g and through the opening g2in the shaft, out in to the pipe e or other receptacle; as fast as Waterfrom the compartment F2, enters the channels of the wheel, its rotaryvelocity will be decreased by the wheel, and consequentlyits pressurewill also be deereased,so that it will at once be forced toward thecenter and on its way out and be discharged; of course, as the waterflows from the-compartment F2, the water from the passage F will ow intoit,

` and in turn the water will fiow'rapidly through the perfor-ations f',into the passage, carrying with it the heavier particles being disturbedfrom the separating surface by the outflow of water, through theperforations f. d

The velocity of the flow of water through the perforations f and therapidity with which the water, are discharged, by means of the wheelG,are determined principally by the rate of speed at which the wheel isrun, or the rate of differential yspeed vbetween the wheel, anddeflector,the slower the Velocity of the wheel, with relation to that ofthe deiiector, and vessel, the more rapid willbe the current of water,and the greater will be the amount charged through them, should be aboutthe amount taken lip-through the perforations f so that the clean waterdischarged by them will be that taken up and discharged with the heavierportion of the material treated; the force or speed of flow through theperforations fmay be regulated by the amount of Water, introduced intothe defiector. v

Preferably around the largest diameter of the treatment vessel areprovided holes or orivfices b2, for thediseharge of the lighter materialand a part of the water, and atrou'gh or curbing E, is preferablyarranged around these discharge holes or orifices to catch theA Waterand material discharged thereat, so that it can be carriedo through oneor more discharge pipes e. The material to be treated, is introducedthrough a pipe ,F,'which enters a hollow trunnion of the treatmentvessel, and delivers the material in a finely powdered condition, andpreferably mixed or diluted with'water into the receiving end of thetreatment'vessel. The material and waterimmediately pass through theaction of centrifugal force, tothe wall of the treatment Vessel andpasses along the separating surface, toward the discharge holes ororifices b2.

.Before the operation isV commenced a suicient quantity of water ispreferably introduced into the'treatment vessel and deector, to partlyfill them. As the operation begins, the water in the machine assumes aposition IOO to the outside, leaving a hollow space along the center, as:shown in Fig. 1.

The waterintrodueedinto the machinevdui`- ing its operation is intendedto be suiiicient to maintain about the same quantity of wamoved from themachine,

| The current of Water flowing over the separating surface is intendedto be maintained atsutiicient strength and rate of speed to wash off andcarry away the lighter and more worthless particlesof the material, anddischarge them through the orifice b2, without beingsuf fciently rapidand strong to carry off the heavier particles, which Iare allowed tolodge on the separat-ing surface of the treatment- Ater therein, or, inother ;verds,to compensate for the4 water constantly discharged or rep 1vessel, and within -the channel 'or passagerr by other means, as above'described.

one wall of a covered channel or passage' surface, and material isbeing` washed or-I 6s .against the separating surface, is preferably.the holes or perforations into the passage,"

- VWhilenmveshown anddescribedthemeansf same may be-speciiie'd in theclaims.` a

- tain a body of Water while in operation and -provided twith aseparating surface, (means th rough' the instrumentality of jets orstreams where the separation is effected, to be removed The current ofWater, forced or driven through the holes, or perforations f, and

intended to be sufficiently strong and violent to disturb and bringinto-'a state of suspenfv sion the particles of the heavier materialthat have lodged on the separating surface, and brought into proximityto such perforations, through the differential 'speed of rotation of theseparating surface and the defiector, or" other equivalent means, while,at the same:i time, the dow, or current of water' through F,-operatinglike a'suction, so to speak, isfl intendedto'be, sucieritly rapid andstrong to carrywith it vthe particles of heavier-mate-' rial disturbedfrom-the separating surfaceby theforce of the water, fromthep'erforationsf f, whence it'isearriedwiith the .water through 'if thepassage .1F,'int-o the compartment F2, andf forced'thronglhsthe 'openingin the Wheel -G,=' and through the perforatons and the'hollow in thatend o'f -the= shaft fD, Where 'it4 is' dis#f charged in apip'eor-"conduit'e', to 'adesired receptacle as has been hereindescribed.

What I regard as new, and desire to secure 1.` In a centrifugal oreseparator, the com-g bination-'sof a rotatablvessel adapted to con-` ofwater for removing heavier material from one portion of such surfacewhile thelig'hter material 'is being separated .and discharged fromanother portion thereofhsubstantially 2. In a centrifugal ore separator,the vcom-L bination'of 'a rotatable vessel adapted to con-l tain a'bodyof -water r,While in operation 'and' provided with aseparating surface,forming means for removing .heavier material from one portion of theseparating surface, and' discharging it at the axis of rotation whileat-the same time the separation is vbeing effected on another portion ofthe Vseparating cleansed upon still another portion of such` 'stantiallyas described surface, substantially as described.

ln a centrifugal ore separator, the com-- binationof a rotatable vesseladapted to con-Y tain'a bodyof 'water While 'in operation 'and "providedAwith-a separating surface,` vand means, rotatable independently ofthese'parating surface, for removing the heavier-ma,

terial from'one portion' of'such surface :while the separation'of-thelighter -is being e'ected upon another. portion thereof,substantially as described. A

4. VIn aeent'rifugal ore separator, theconn bination of a rotatablevessel vadapted to con -tain'a body ofwaterwhile in operation andprovided with a separating surface, means sdf for remov-ing'h'e'avierniaterial'from one portion of the separating'snrface whleetheseparation' of lighter 'material is being effected' on another portionthereof, and mea-ns for'preventing the lighter 'material from 'beingdeposited on that portion of -thejseparati'n'g s'u'r- -face from whichthe heavier material is being removed, 'substantially as described.l

5'. `Inacentrifugal'ore separator, the-'coml' Ybination of'a rotatablevessel' 'adapted-'to contain a bod-y' of water while inA operationundprovided with la separating surface, forming ione 'Wall "of a coveredchannel"orp'assage means -for removing heavier material'from one portionof "theseparating-surface and discharging it ,at the 'axis of `rdtationwhile the sepanation of 'the lighter'fmaterial'is oeing eect-edonanother porto'nithe'reof, 'and mea'ns'for preventing'theeseapeof theheavier materialf-rom'that portion of the separating surface 'fromvwhich it is being removed, sti-b- 6. In a centrifugal orev separatorthe, 'combination of a rotatable vesselfadaptedito com tain-a body oflWater while iu operation,l and provided with a separatingysurfacefm'eans for removing -heavier material from oneporflos tion ofthe separating surfaoejwhile sepaation'of lthe lighter material is beingeffected `on, another portion thereof, and means for 'preventing thelighter,v material from being deposited on .that portion'of'theseparating .IIC

surface from which 'the heavier `material is being removed, travelingwith re'spectto'the separating surface, substantially asdescribed.

7. In a centrifugal oreseparator,fthe combination of arotatable vessel'adapted tocontaina 'body of Y water while in operation and providedwith a separating surface, means I for removing .heavier 'material fromone portion of the separating surface'while the sepa? ration ofthelighter material is being effected 'si i' on another portion thereof,and traveling'partitions between vthat portion of lthe separat- 'ingsurface upon which the lighter material is being separated, and thatportion from substantially as described.

' 8. 'Ina7 centrifugal ore separator, the combination of a rotatablevessel adapted'to contain a body of water while iu operation andprovided with aseparating surface, forming one' wall of a coveredchannel o'r passage` means for removing heavier material from which theheavier material is being removed, f

from one portion of such surface and disand discharging it at the axisof rotation while bination of a rotatable vessel adapted to confordeflectin g and guiding m aterial'along near,

- for deliecting and guiding material alon g near, or in yproximity. to

.lighter is being separated' from another por `bination of a rotatablevessel adapted to concharging it at the axis of rotation While thelighter material is being separated andv discharged from another'portion thereof, substantially as described.

10. In a centrifugal ore separator,'thecom bination of a rotatablevessel adapted tocontain a body of Water while in operation and providedwith ay scparatingsurface, means for deilecting and guiding materialalong near orin proximity to the separating surface, rotatableindependentlyvv of such surface, and means for removing .the heaviermaterial from one portion of the separating surface,"

the lighter material is being separated on an. other portion thereof,'substantially as de-y scribe v 11. In a centrifugal ore separator, thecomtain a body of water. while in' operation and provided with aseparating surface, means for deilecting and guiding material along nearor 'in proximity to the* separating surface, means through theinstrumentalityof jetsor streams ofwater for stirring or disturbingmaterial on the separating surface, and means for :removing the heaviermaterial from one portin of the separating surface While the tionthereof, substantially as described. 12. In a centrifugal ore separator,the com'- bination of a rotatable vessel, adapted to contain a body ofwater while in operation and provided with a separating-surface, mean's`or in proximity to the separating surface, and means rotatableindependently of the separating surface for `removing the heaviermaterial from one portion of such surface, while the lighter material.is'y beingv separated, and discharged fromanother portion thereof,substantially as described.

13.- Ina centrifugal ore'separator, thecomtain a body of water while inoperation and provided with a separating' surface', means the separatingsurface, means for 'removing heavier "material from on portion'of theseparating surface, while the lighter material is being separated anddischarged from'another portion thereof, and.

means for preventing the lighter materialv from being deposited on thatportion of the separating surface from which the heavier material isbeing removed, substantially as described. l-

14. In a centrifugal ore separator, the cornbination of .a rotatablevessel adapted to contain a body of water while in operation andprovided with a separating surface, means for deliecting and guidingmaterialalong near, or in proximity tothe separating surface, means forremoving heavier material from 'one portion of such surface While thelighter material is being separated and discharged from another portionthereof, and means traveling with respect to such surface for preventingthe escape of the heavier material from that portion of the separatingsurface from which it is ybeing removed, substantially asdescribed.

15,. In a centrifugal ore separator, the coinbination of a rotatablevessel, adapted to contain abody of v water While in operation andprovided with a separating surface, means for deflecting `a-nd guidingJnaterial along near, or in proximity to the separating surface, meansfor removing the heavier material from one portion of such separatingsurface while lighter. material is being separated and dischargedfromfanother portion thereof,

and traveling partitions between that portion of the separating surfaceupon which the' lighter material is .being separated, and that portionfrom which the' heavier material 1s.

.being removed, substantially as described.

.16.-A In the centrifugal ore separator, the A combinationof arotatable'vessel adapted to contain a body of Water while in operationand provided wit-h a separating surface, means fory deflectin'g andguiding material along near, or in proximity to the separating surface,means through the instrumentality' of jets or streams of water forremoving heavier-'materialfrom one portion of the separating surface,While lighter material is' being separated upon another portion of suchsurface, and means for detaching or disturb-v ing the heavier materialfrom the separating surface, substantially as described.r

17. In a centrifugal ore separator, the combination of tw'o rotatablecylinders, one within the other, with a channel or passage be-- tweenthem, a separating surface forming one wall of such channel or passage,and means through'the instrumentality of jets or streams ofwaterfor-removing the heaviermaterial from bne portionV of theseparating surface while the yseparation and removal of the lightermaterial are being effected on another portion thereof, substantially asdescribed.

`18. In a centrifugal ore separator, the combination of twocylinders,'rotatable independently with respect to each other, one 1ocated withinthe other, with a channel or passage between them, a separating "surfaceforming one wall of suchchannel or passage,

and means for removing the heavier material from one portion of theseparatlng surfacewhile the separation of the material is being effectedon another portion thereof, substantially as described.

19. In a centrifugal ore separator, the com-v bination of two coneshaped cylinders or ves sels rotatable independently with respect toeach other, one located within the other, with a channel or passagebetween them, a separating surface forming one wall of such chant nel-orpassage, and means for removing 'the heavier material from one portionof the separating surface while the separation is-being effected onanother portion thereof, substantially as described. i

20. In a centrifugal ore separator, the'coinbination of two rotatablecylinders, one within the other, with a channel orpassage between them,a separatingsurface forming one wall of such channel orl passage, Vmeansfor introducing water into the4 inner cylinder, the inner cylinderprovided with perforations through its wall, whereby water is projectedor sprayed against the separating surface or material thereon, and arotatable wheell for moving heavier material from one portion of theseparating surface, while the separationis being effected on anotherportion thereof substantially as described.

21. In a centrifugal ore separator, the com-4 bination of two rotatablecylinders one within the other, with a channel or passage between them,and a separating surface forming one wall of such channel or passage,means for introducingr -water into the inner cylinder, and means throughperforations in said inner cylinder for removing the heavier materialfrom one portion of the separating surface, while the separation isbeing effected on another portion thereof, substantially as` described,

22. In a centrifugal ore separator, the combination of two rotatablecylinders, one within the other, with achannel or passage between them,and with `a separating surface forming one Wall of such channel orpassage, meanswithin the inner cylinder communicating with a compartmentwithin the separator,the covered channel or passage provided withperforations through which the heavier material is collected from theseparating surface, and means for removing and discharging water andheavier material from the compartment, substantially as described.

discharged from the 24. In a centrifugal oreseparator, the coin-ylbination of two rotatable cylinders, one within 4is collected .from theseparating surface,l and a wheel provided with channels orpassagestherein, communicating with alicllow shaft, and' adapted to be rotatedwithin the compartment, whereby heavier material and water are removedfromthe separating surfaeeand separator, substantially as described. 1 y

25. In a centrifugal ore separator, the coinbination of two rotatablecylinders, one within the other, and having a space between them acovered channel or passage within the inner cylinder communicating witha I compartment withinthe separator, and prolvidedl with holes orperforations communieating with said space, between the cylinders, meansfor disturbing the heavier material on the separating surface, and meansfor removing water and material from `the compartment and dischargingthem from the sepai'ator, substantially as described.

26. In a centrifugal ore separator,tlie combinationpiof t-wo rotatablecylinders, one within the other, with a channel or passage between thema covered channel or passage within the inner cylinder, communicatingwith acompartment within the separator, and provided with holes orperforations communicatin g with -said covered channel or passagebetween the` cylinders, means for disturbing the heavierv material fromthe separating surface, and awlieel adapted to rotate within ICC thecoinpartmennand provided with cliant nels or passages communicating withthe compartment, whereby water and heavier ina terial are dischargedfrom the separator, substantially as described.

27. In a centrifugal ore separator, the combination of two rotatablecylinders, one within the other with a channel or passage betweenthern,aseparating surface forming-one wall of such channel o'r passage,a covered i channel or passage within the inner cylinder communicatingwith a compartment in the separator, `the cov-ered channel -oi''passages provided with holes or perforations eoniinu'- nicating withthe channel or passage between IIO the cylinders, means 'for removingheaviery and water are removed from the separating surface anddischarged from the separator, substantially as described.

I29. In a centrifugal ore separator, the com? 5' bination of tworotatable cylinders, one within the other, with a channel or passagebetween tl1em',a separating surface forming one wall of such channel orpassage, a covered channel or passage within the inner cylindercommunicating with a compartment within the separator, the coveredchannel or passage provided with holes or perforations for the passageof water and heavier material th'erein, the inner cylinder provided withholes or perforations for the escape of water therefrom, means forintroducing water into the inner cylinder, and means for removing Watervand heavier material from the compartment and discharging them from theseparator, substantially as described.

30.l In a centrifugal oreseparator the combination of a rotatable vesselprovided with a separating surface and adapted tocontain oRRIN B; PECK'.Witnesses:

R. S. HALL, R. G. HUDSON.'

